If someone wants a long term relationship, they should only sleep with someone after they've committed. Waiting to be intimate increases the likelihood of getting to know someone (no oxytocin goggles blinding you to dealbreakers) and also shows that you're serious about finding an LTR. You're way more likely to justify red flags if you've already been intimate with someone. Someone who wants a relationship should never be a plate/FWB, no matter what garbage the man/woman tells you. If they claim they need to know how compatible you are in the bedroom- that's bunk. It's not necessary to get down to know if you're compatible. A frank discussion will do.

In addition, if N count is so important to men, this practice will keep N counts down by virtue of filtering out men/women who want to pump and dump. They won't stick around for the weeks/months you wait. In the meantime, it's not like you can't make out. That's a fun activity in itself that's not done enough that promotes closeness.